A lot of people were impatient with Seasonic back when the Prime series of units were announced. They wondered when these units were ever going to hit the market, and why they were so content with EVGA and Super Flower getting the jump on them in the marketplace. When I reviewed the 750W model, it became apparent that Seasonic just wanted to make sure they got the job done right. Now, I have the 850W model on the load testers. Let's see if it measures up to some really lofty expectations.

Absolutely amazing stuff from Seasonic, Superflower must be nervous now with such a good unit like this competing.
My favorite thing of all is the tight voltage regulation,all Japanese caps,and barely no wires being used inside the PSU.

Has Seasonic mentioned if there will be lower wattage units like this 650w? 550w? or maybe even higher like 950w? 1000+w?

Higher wattages will probably come later and won't use the exact same platform, this platform is only from 650W till 850W. But that's normal, platforms almost always scale 200/300W and above that a different platform is used.